He needs to focus on the rest of Kogarasumaru in general.
Ikki since he's the main character of course.
He also needs to give Kazu a bit more screentime...I'm still waiting for Kazu's true moment to shine. He said he figured out how to use the flame regalia but LOL AGITO and he didn't get a chance to show it.
Buccha also needs to do something. They foreshadowed a bit that he'll have an upcoming important role...let's hope it comes true.
And Onigiri's just there for the lulz.